Hello, I always go to this sight for insight on tractor questions don't usually have to post to find an answer, but... -Fellow has an 1175 for sale, says the high range first gear started making a popping noise when he was going down a hill. Said it sounded like a gear tooth out maybe or two gears tapping. He's continued to use the tractor without issue for 4 years by avoiding that gear. Said the other day someone came to look at it and it didn't make the noise when they drove it. Tractor has 8,000 hours and had an engine overhaul at 6,000. Wondering what your thoughts were on the possible causes and potential costs and value. I thought the 8-speed manuals were pretty bullet proof...? Thanks.